I modified the source code of our SSL front end to disable v3 using SSL_OP_NO_SSLv3 flag (in addition to the v2 one which was there already).
When I do this, the SSL Labs test just fails all together, but using a browser it works just fine. Trying with openssl s_client shows SSLv2/3 fails and TLS works.
And when I runned the test before disabling v3, it correctly showed that TLS was used for all browsers except for the IE6/XP combination.
What could be the issue ?